 | Version I = exhaust in and out connections without recess, with gaskets |
| Version II = exhaust in with recess and fill-in gasket seal, exhaust out without recess, with gasket |
| Version III = exhaust in and out connections with recess and fill-in gasket seals |
| Note Flanges from exhaust manifold and tailpipe to turbocharger have not been modified |
Turbocharger Comparison Table |
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| Engine Type | Model Year | Turbocharger Part No. | Version | Nameplate No. |
| M 31.02 | 1980 | 931 123 004 04 931 123 004 05 931 123 004 06 |
I II III |
5326 970 6401 5326 970 6404 5326 970 6406 |
| M 31.04 | 1981 | 931 123 004 07 | III | 5326 970 6020 |
| Note Turbochargers on 1980 models are not interchangeable with those on 1981 models. |
Exhaust Manifold, Part No. 931 111 093.02, for 1980 cars, has been replaced by reinforced manifold, Part No. 931 111 096 00.
This new-type manifold has recess for fill-in gasket seal in flange to by-pass pipe.
When installing new-type exhaust manifold for the first time, use by-pass pipe, Part No. 931 123 033 04, and fill-in gasket seal, Part No. 931 123 195 00. The new by-pass pipe can be connected to the old manifold without recess.
| CAUTION The fill-in gasket seal and never the old-type gasket must be used on recessed flange connections. |
If turbo exhaust-manifold studs loosen or break,
| install new studs of different material, Part No., 900 081 053 00 |
| also always install new self-locking nuts, Part No., N900 730 01 |